// Lookup returns the encoding with the specified label, and its canonical // name. It returns nil and the empty string if label is not one of the // standard encodings for HTML. Matching is case-insensitive and ignores // leading and trailing whitespace. Encoders will use HTML escape sequences for // runes that are not supported by the character set. func Lookup(label string) (e encoding.Encoding, name string) { … } type htmlEncoding … func (h *htmlEncoding) NewEncoder() *encoding.Encoder { … } // DetermineEncoding determines the encoding of an HTML document by examining // up to the first 1024 bytes of content and the declared Content-Type. // // See http://www.whatwg.org/specs/web-apps/current-work/multipage/parsing.html#determining-the-character-encoding func DetermineEncoding(content []byte, contentType string) (e encoding.Encoding, name string, certain bool) { … } // NewReader returns an io.Reader that converts the content of r to UTF-8. // It calls DetermineEncoding to find out what r's encoding is. func NewReader(r io.Reader, contentType string) (io.Reader, error) { … } // NewReaderLabel returns a reader that converts from the specified charset to // UTF-8. It uses Lookup to find the encoding that corresponds to label, and // returns an error if Lookup returns nil. It is suitable for use as // encoding/xml.Decoder's CharsetReader function. func NewReaderLabel(label string, input io.Reader) (io.Reader, error) { … } func prescan(content []byte) (e encoding.Encoding, name string) { … } func fromMetaElement(s string) string { … } var boms …